Paper-making machine.



C. E. POPE.

PAPER MAKING MACHINE. APPLICATION FILE-D AUG-25. 1913.

Patented Sept. 12,1916.

[2206122027 aim/Jail? 5y M'zizawasv 4W mwhwm CHARLES E. POPE, OF HOLYOKE, MASSACHUSETTS.

PAPER-MAKING MACHINE.

Specification of Letters'Patent.

Patented Sept. 12, 1916.

Application filed August 25, 1913. Serial No. 786,461.

To all whom it may concern:

Be it known that I, CHARLES E. POPE, a citizen of the United States, residing at Holyoke, in the county of Hampden, in the State of Massachusetts, have invented certain new and useful Improvements in Paper- Making Machines, of which the following is a specification.

This invention relates to paper making machines and more particularly to a device for picking a layer of pulp from the making wire of a paper machine in an improved manner. It finds one of its best adaptations in connection with a Fourdrinier machine in which, the pulp is formed on a wire which travels continuously in the paper making operation. I

The accompanying figure illustrates d agrammatically a.portion of a Fourdrinier machine which is directly involved in the application of my invention.

Referring to this figure, the frame carrying the wet end of the machine is designated 1', and the frame carrying the felts is designated s. A portion of the making wire 6 of the machine is shown as it passes over suction box 0, guide rolls (Z, and between the couch rolls 6 and f. The layer of pulp or, shown by dotted line is carried by the wire I), as shown. The felt is passes around the upper couch roll 6 and meets the layer of pulp held on the wire as the latter passes between the couch rolls. Instead of the wire passing around the lower couch roll 7 as has heretofore been the practice, it passes around a supplemental guide roll 72., suitably mounted in frame 8. Roll It is located beyond the couch rolls, that is, it is spaced from the couch rolls in the direction of travel of the making wire. This arrangement is of particular importance in a high speed machine since all the sharp turns, which must usually be taken by the paper web while in a weak condition, are eliminated. Between the couch roll f and the supplemental guide roll h, I place another guide roll 9 which bears against the felt pressing it against the layer of pulp carried by the wire b. The felt is travels at an angle away from the wire I) and meets the lower felt w guided by rolls m in a manner shown in the drawing. It will be noticed that where the felt and the sheet of pulp leaves the wire, the under surface of the wire does not bear against the couch roll or any other surface which would hold the ends of the fibers clenched to the wire. These fibers are, therefore, free to be pulled out with very little force as the felt leaves the wire, carrying the sheet 0 pulp with it. This, I believe, to be broad y new.

In the ordinary operation of the Fourdrinier machine the wire together with a sheet of pulp passes between couch rolls which press the sheet of pulp before it is transferred to what is called the pick up felt. The making wire, according to present practlce, passes around the lower of the two couch rolls before beginning its backward travel, the felt ordinarily passes around the upper couch roll and comes in contact with the sheet of pulp on the wire, causing the said sheet to be picked off by the felt and carried away from the wire. In manufacturing some papers, there is considerable difliculty in getting' the layer of pulp away from the wire and on to the surface of the felt. In analyzing the difficulties involved. I have found that the fiber forming the pulp sheet, passes through the small meshes of the wire and extends from the under side thereof, so that when the wire passes around the lower couch roll these downwardly hanging ends of the fibers are clenched and held to the wire. felt tends to pick the layer of pulp away from the wire these fibers, being clenched to the wire and held clenched by the surface of the lower couch roll, tend to prevent the desired transfer. For a long time paper makers have known that the difficulty exists, but, there has not, as far as I know been an adequate explanation of the difliculty as I have explained it.

' If the paper being made is heavy enough it will have sufficient strength to be pulled away from the wire in spite of the clenched fibers. On the other hand if it is light enough the strength of the clenched fibers will not bevsuflicient to prevent its ready transfer to the felt. But between these two conditions there are many weight papers desired where the clenched fibers are strong enough to prevent the proper transfer of the When the .3-

sheet of pulp from the wire at a point where H 5.

the latter is in contact with the roll. In, order to obviate this difiiculty it has been customary in the past to groove the lower couch roll or to perforate this roll. I By this means there is a smaller area of the wire in actual contact with the couch roll, than if the latter were not grooved or perforated.

' wine with a small amount of force.

. the rolls,

This results in the felt picking the paper off the wire because of the decreased holding area of the clenched fibers as the wire passes around the grooved roll. many disadvantages in either grooving the roll or perforating it' besides the expense involved. For example, it is well-known that the two couch rolls are pressed toward one another with considerable force and this pressure on the wire which passes between causes the Wire to be pushed into the grooves or perforations, thus shorten ing its life.

I provide means for picking off the layer of pulp at a point where the underside of the wire is not in contact with any roll, either grooved or perforated, but on the contrary is exposed, so that as the layer of pulp leaves the wire the ends of the fibers which are ordinarily held clenched by the roll, are free to be pulled through the meshes of the It will thus be seen that by my invention the roll, instead of being grooved or perforated can be smooth and that the pulp layer will be transferred to the felt in an improved manner.

It will be understood that the machine. illustrated in the drawings is intended to illustrate a ortion of the F ourdrinier machine with the parts operating as usual, ex-

cept for the improved adaptations of the machine as specifically described. I realize that many different adaptations of my invention might be made to the F our drinier and other machines and I have, therefore, illustrated and described the specific adaptation for illustrative purposes only.

What I claim is combination a movable making wire, couch rolls between which the wire and sheet thereon pass together with means located beyond the couch rolls for guiding the wire and a felt arranged to pick off the sheet from the wire between the couch rolls and said guiding means.

2. A paper making machine, having in combination a movable making wire, a felt suitably mounted in the machine,- couch rolls between which the wire and the felt pass with the pulp sheet therebetween, means for guiding the wire beyond the couch rolls, and means constructed and arranged to guide the felt and sheet away from the wire between the couch rolls and said guiding means.

3. A paper making machine having in combination, a movable making wire, couch rolls between which the wire and sheet there- There are J 1. A paper making machine having inon pass, a felt, means for pressing the felt against the sheet on the wire at a point beyond the couch rolls where the underside of the wire is exposed and thereafter separating the felt and sheet carried thereby from the wire at such a point.

4. A paper making machine, having in combination, a movable making wire, a felt suitably -mounted in the machine, couch rolls between which the wire and the felt pass with the pulp sheet therebetween, a w

its upper to its lower travel, an upper couch.

roll, a movable endless felt passing around the upper couch roll and into contact with the pulp sheet carried by the wire, means lo- .cated between the couch roll and the guide roll to press the felt against the pulp sheet and to guide the latter and the felt away from the wire at a point where the underside of the Wire is exposed.

6. A paper making machine comprising, in combination, a making wire, couch rolls, an upper felt carried around the upper couch roll, means to guide the wire and felt with the pulp sheet therebetw'een beyond the couch rolls, and means to separate the felt with the pulp sheet adhering on the underside thereof from the wire at a point where the underside. of the latter is exposed.

7. A paper making machine having in combination. the movable endless making wire, the couch rolls between which the wire bearing the formed mental roll beyond .the couch rolls around which the wire passes before beginning its return,-a movable endless felt arranged to move in contact with the paper sheeton the paper making wire for a portion only of the distance between the couch rolls and the supplemental roll and means for pressing the felt against the sheet on the wire between said rolls to bring the sheet in intimate contact with the felt and thereafter to separate the felt and sheet carried thereby paper passes, a supple- 

